CN-117705967-B - Fault diagnosis system of on-line monitoring device for dissolved gas in transformer oil

CN117705967BCN 117705967 BCN117705967 BCN 117705967BCN-117705967-B

Abstract

The invention discloses a fault diagnosis system of an online monitoring device for dissolved gas in transformer oil, and relates to the technical field of online monitoring equipment; the oil-gas separation device comprises a sampling unit, a detection unit, a standby oil outlet unit, a standby oil-gas separation device, a recovery oil barrel, a public oil outlet pipe and a public gas sampling pipe, wherein the sampling unit comprises first to third sampling units with the same structure, the standby oil outlet unit comprises first to third standby oil outlet units with the same structure, one end of the first sampling unit is connected with the public gas sampling pipe, the other end of the first sampling unit is connected with the public oil outlet pipe through the first standby oil outlet unit, one end of the standby oil-gas separation device is connected with the public gas sampling pipe, the other end of the standby oil-gas separation device is connected with the public oil outlet pipe, the standby oil-gas separation device is connected with the recovery oil barrel, and the first to third standby oil-gas separation device, the recovery oil barrel, the public oil outlet pipe, the public gas sampling pipe and the like are used for avoiding oil mixing of a transformer, and any oil-gas separation unit fault in the monitoring device can be positioned in time.

Inventors

LIU XIAOFEI
YANG LIYUAN
ZHANG BAOQUAN
ZHAO ZHILONG
HU WEITAO
LI JIANPENG
JIA XIAOYU
WANG ZHIYUAN
Yang Kainan
LI ANG

Assignees

国网河北省电力有限公司超高压分公司
国家电网有限公司

Dates

Publication Date: 20260505
Application Date: 20231129

Claims (5)

1. The fault diagnosis system of the on-line monitoring device for the dissolved gas in the transformer oil comprises a sampling unit and a detection unit and is characterized by further comprising a standby oil outlet unit, a standby oil-gas separation device, a recovery oil barrel, a public oil outlet pipe and a public gas sampling pipe, wherein the sampling unit comprises first to third sampling units with the same structure; The oil outlet of the transformer is connected back to an oil return port of the transformer through the oil-gas separation unit at the transformer side, the standby oil outlet unit comprises a standby oil outlet pipe and a standby oil outlet valve, the oil outlet of the transformer is connected and communicated with one end of the standby oil outlet pipe, the other end of the standby oil outlet pipe is connected and communicated with the public oil outlet pipe, and the standby oil outlet valve is fixedly connected to the standby oil outlet pipe; The detection unit comprises a separation input pipe, a separation input valve, a gas separation unit, a separation output pipe, a separation output valve, a detection input pipe, a detection valve, a gas detection unit and a processor, wherein the separation input pipe, the gas separation unit, the separation output pipe and the detection input pipe are sequentially connected and conducted, the separation input valve is fixedly connected to the separation input pipe, the separation output valve is fixedly connected to the separation output pipe, the detection valve is fixedly connected to the detection input pipe, and the gas detection unit is electrically connected with the processor; the number of the detection units is two, the detection units are respectively a first detection unit and a second detection unit which are the same in structure, each separation input pipe is connected and communicated with a public gas sampling pipe, one end of the public gas pipe is communicated with an outlet of a separation output pipe in the first detection unit, the other end of the public gas pipe is communicated with an outlet of a separation output pipe in the second detection unit, each processor is respectively and independently electrically connected with each oil-gas separation unit, a gas sample valve, a standby oil outlet valve, a separation input valve, a separation output valve, a detection valve and a gas detection unit, and the two processors are electrically connected; Comprises the following steps of the method, The detection step comprises: the first detection unit is used for respectively controlling each sampling unit to perform oil circulation, oil sample taking and oil-gas separation, and performing gas separation and gas detection and obtaining detection data; And fault diagnosis: when the first detection unit acquires that the detection data corresponding to all the sampling units are abnormal, the first detection unit controls the standby oil-gas separation device and the standby oil outlet unit corresponding to the sampling unit for detecting the data abnormality to work, new detection data are acquired, when the data updating is acquired and the data is recovered to be normal, the failure of the oil-gas separation unit in the sampling unit is acquired, and the information that the failure of the oil-gas separation unit of the sampling unit is replaced is output.
2. The fault diagnosis system of the on-line monitoring device for dissolved gas in transformer oil according to claim 1, wherein in the fault diagnosis step, when the first detection unit acquires that the corresponding detection data of all the sampling units are abnormal, the first detection unit starts to check from any sampling unit; the first step, a processor of the second detection unit controls and only opens a gas sample valve of the current sampling unit, a separation input valve, a separation output valve and a detection valve of the first detection unit; The second step, the processor of the second detection unit controls and enables the gas separation unit and the gas detection unit of the first detection unit to finish detection and obtain detection data, and the processor of the second detection unit obtains the content of each gas in the transformer insulating oil of the current sampling unit according to data calculation and judges whether the detection data updating of the transformer of the current sampling unit is normal or not; When the normal state is recovered, the processor of the second detection unit outputs the information that the processor of the first detection unit fails and requests replacement, and replaces all the processors of the first detection unit to work; if the normal state is not recovered, performing a third step; The third step, the processor of the first detection unit controls and enables only the gas sample valve of the current sampling unit, the separation input valve and the separation output valve of the first detection unit and the detection valve of the second detection unit to be opened; the processor of the first detection unit controls and enables the gas separation unit of the first detection unit and the gas detection unit of the second detection unit to work, complete detection and obtain detection data, and the processor of the first detection unit calculates and obtains the content of each gas in the transformer insulating oil of the current sampling unit according to the data and judges whether the detection data update of the transformer of the current sampling unit is normal or not; When the gas detection unit is recovered to be normal, the processor of the first detection unit outputs the information that the gas detection unit of the first detection unit fails and is replaced, and the gas detection unit of the second detection unit takes over all the work of the gas detection unit of the first detection unit; when the normal state is not recovered, a fifth step is carried out; Fifthly, the processor of the first detection unit controls and enables only the gas sample valve of the current sampling unit, the separation input valve and the separation output valve of the second detection unit and the detection valve of the first detection unit to be opened; The processor of the first detection unit controls and enables the gas separation unit of the second detection unit and the gas detection unit of the first detection unit to work, complete detection and obtain detection data, and the processor of the first detection unit calculates and obtains the content of each gas in the transformer insulating oil of the current sampling unit according to the data and judges whether the detection data update of the transformer of the current sampling unit is normal or not; When the gas separation unit is recovered to be normal, the processor of the first detection unit outputs the information that the gas separation unit of the first detection unit fails and is replaced, and the gas separation unit of the second detection unit takes over all the work of the gas separation unit of the first detection unit; And when the normal state is not recovered, the processor of the first detection unit outputs the information of pipeline and line faults among the units.
3. The fault diagnosis system of the on-line monitoring device for dissolved gas in transformer oil according to claim 1, wherein the first detection unit comprises a first separation input pipe, a first separation input valve, a first gas separation unit, a first separation output pipe, a first separation output valve, a first detection input pipe, a first detection valve, a first gas detection unit and a first processor, the first separation input pipe, the first gas separation unit, the first separation output pipe, the first detection input pipe and the first gas detection unit are sequentially connected and conducted, the first separation input pipe is connected and conducted with a public gas pipe, the first separation input valve is fixedly connected to the first separation input pipe, the first separation output valve is fixedly connected to the first separation output pipe, the first detection valve is fixedly connected to the first detection input pipe, the first gas detection unit is electrically connected with the first processor, the second detection unit comprises a second separation input pipe, a second separation input valve, a second gas separation unit, a second separation output pipe, a second separation output valve, a second detection input pipe and a second gas detection unit are sequentially connected and conducted with the first gas detection unit, the second detection unit is connected with the public gas detection unit, the first separation input pipe is connected with the second detection input pipe, and the second detection unit is electrically connected with the second detection unit, and the second detection unit is connected with the first separation input pipe, and the second detection unit is electrically connected with the second detection unit, and the second detection unit is connected with the second detection unit.
4. The fault diagnosis system of the on-line monitoring device for dissolved gas in transformer oil is characterized in that the first sampling unit comprises a first transformer, a first oil-gas separation unit, a first gas sampling pipe and a first gas sampling valve, the first standby oil outlet unit comprises a first standby oil outlet pipe and a first standby oil outlet valve, an oil outlet of the first transformer is connected back to an oil return port of the first transformer through the first oil-gas separation unit, an output port of the first oil-gas separation unit is connected and communicated with one end of the first gas sampling pipe, the other end of the first gas sampling pipe is connected and communicated with a public gas sampling pipe, the first gas sampling valve is fixedly connected and communicated with one end of the first standby oil outlet pipe, the other end of the first standby oil outlet pipe is connected and communicated with the public oil outlet pipe, the first standby oil outlet valve is fixedly connected with the first standby oil outlet pipe, and the first oil-gas separation unit, the first gas sampling pipe and the first gas sampling valve form the first oil-gas separation device.
5. The fault diagnosis system of an online monitoring device for dissolved gas in transformer oil according to claim 1, wherein the sampling units further comprise fourth to sixth sampling units, the first to sixth sampling units are identical in structure, the spare oil outlet unit further comprises third to sixth spare oil outlet units, and the first to sixth spare oil outlet units are identical in structure.

Description

Fault diagnosis system of on-line monitoring device for dissolved gas in transformer oil Technical Field The invention relates to the technical field of online monitoring equipment, in particular to a fault diagnosis system of an online monitoring device for dissolved gas in transformer oil. Background The transformer is the most important main equipment of the power system, and is safe and stable to operate, and has great significance in ensuring safe and stable operation of the power grid. The device for monitoring the dissolved gas in the transformer oil on line, which is hereinafter referred to as a monitoring device, can complete the test of the dissolved gas in the transformer insulating oil several times a day, and is one of the most effective means for monitoring the running state of the transformer. The fault of the monitoring device is frequently affected by the running environment, and after the fault of the monitoring device, the dissolved gas in the transformer oil can lose an on-line monitoring means, so that the fault can not be found in time when the internal discharge fault exists in the transformer. Therefore, the oil chromatography on-line monitoring device is placed in the same important position as relay protection. Providing a primary and a secondary monitoring device in accordance with the protection device would lead to a substantial increase in costs. The 500kV transformer substation of the regional power grid at least comprises six transformers, so the example of monitoring the dissolved gas in six transformer oils is explained. Currently, an online monitoring device is deployed as a monitoring device for measuring dissolved gas in oil of a main transformer. There is a huge waste of resources. The reason is that one monitoring device has the following technical problems when measuring dissolved gas in a plurality of transformer oils: 1. when the monitoring device fails, the device cannot be guaranteed to resume operation at the first time like a protection device. 2. The monitoring device mainly comprises three units, namely an oil-gas separation unit, a gas separation unit and a gas detection unit. The oil mixing occurs in the oil-gas separation link, oil samples of different transformers enter the oil tank of the monitoring device to cause the oil mixing, the oil mixing risk cannot be caused by the participation of insulating oil in the gas separation and gas detection link, and the most expensive part of the monitoring device is just the gas separation and gas detection unit. Different transformer oil flows through the same on-line monitoring device, and the risk of oil mixing among different transformers, namely the problem of oil mixing of the transformers, exists. For example, the first monitoring device monitors the dissolved gas in the first transformer and the second transformer oil at the same time, the insulating oil of the first transformer and the insulating oil of the second transformer can be mixed in the oil tank of the first monitoring device, and the mixed oil can flow into the first transformer and the second transformer, so that the insulating oil pollution of the first transformer and the second transformer cannot reflect the actual operation state of the transformers. 3. An on-line monitoring device measures the dissolved gas in many transformer oil simultaneously, can inevitably cause monitoring devices and transformer distance increase, connects the oil pipe between transformer and the monitoring devices to increase, and the longer the oil pipe is, the more the oil sample that remains in it, exists like this in the test oil in the dissolved gas oil be the oil sample that remains in the oil pipe, can't reflect the dissolved gas content in the oil of the insulating oil in the transformer when sampling. 4. The monitoring device obtains detection data and informs the processor, the processor compares the newly obtained detection data with the previous detection data, and when the abnormality of the data is found, the processor cannot timely know which unit among the three units of the oil-gas separation unit, the gas separation unit and the gas detection unit of the monitoring device has faults, namely the fault part cannot be positioned. The application publication number is CN115237023A, and the auxiliary control system of the on-line monitoring device for the dissolved gas in the transformer oil is named. The transformer cross interconnection device is characterized in that the transformer cross interconnection device is formed by realizing the cross interconnection of a plurality of transformers through a three-way pipeline, the on-line monitoring device for the dissolved gas in one transformer oil is respectively used for testing different main transformers through the control electromagnetic valve, the on-line monitoring device for the dissolved gas in the transformer oil is used for simultaneously measuring one main transformer through the control electro